Square Area = s2 (s = side length)



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Square Area = s2 (s = side length)

  • Square Area = s2 (s = side length)

  • Rectangle Area = lw (l = length and w = width)

  • Triangle Area = ½bh (b = base and h = height)





Be careful when identifying the height of a triangle! The height is NEVER a side of a triangle unless the triangle is RIGHT.



a. A square whose sides have length 8 cm.

  • a. A square whose sides have length 8 cm.



b. A rectangle whose length is 5 m and width is 11 m.

  • b. A rectangle whose length is 5 m and width is 11 m.



c. A triangle whose side lengths are 3 in, 4 in, and 5 in.

  • c. A triangle whose side lengths are 3 in, 4 in, and 5 in.



a. A square with area 256 in2.

  • a. A square with area 256 in2.



b. A rectangle with area 345 ft and length 15 ft.

  • b. A rectangle with area 345 ft and length 15 ft.



c. A triangle with area 12 mm and a base length of 6 mm.

  • c. A triangle with area 12 mm and a base length of 6 mm.



Parallelogram Area = bh (b = base and h = height)

  • Parallelogram Area = bh (b = base and h = height)

  • Trapezoid Area = ½ h (b1 + b2)

  • Rhombus Area = ½d1d2 (d = diagonal)



You can justify the area formula for parallelograms as follows:



Ex 3: Find the area of parallelogram ABCD



Ex 3: Find the area of parallelogram ABCD





Ex 5:The area of a trapezoid is 135 cm2, height is 9, and one bases is 11. Find the other base.



Ex 6: Find the area of the rhombus.



Ex 7: The area of a rhombus is 40 in2 and one of the diagonals is 8 in. Find the other diagonal.





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